1397609 has 2 divisors, whose sum is σ = 1397610. Its totient is φ = 1397608.

The previous prime is 1397603. The next prime is 1397633. The reversal of 1397609 is 9067931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1373584 + 24025 = 1172^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1397603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698804 + 698805.

It is an arithmetic number, because the mean of its divisors is an integer number (698805).

2^1397609 is an apocalyptic number.

It is an amenable number.

1397609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397609 is an equidigital number, since it uses as much as digits as its factorization.

1397609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 1397609 is about 1182.2051429426. The cubic root of 1397609 is about 111.8051725552.

The spelling of 1397609 in words is "one million, three hundred ninety-seven thousand, six hundred nine".